📄 ds18b20.lst
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C51 COMPILER V8.02 DS18B20 06/12/2008 17:28:54 PAGE 1
C51 COMPILER V8.02, COMPILATION OF MODULE DS18B20
OBJECT MODULE PLACED IN ds18b20.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE ds18b20.c BROWSE DEBUG OBJECTEXTEND
line level source
1 #include "at89x52.h"
2 #include <intrins.h>
3
4 #define SCAN_CYCLE 300
5 #define uchar unsigned char
6 #define uint unsigned int
7 uchar num1[8]={0x99,0x00,0x00,0x00,0x00,0x00,0x00,0x00};//,0x00
8 uchar num2[8]={0x99,0x00,0x07,0x00,0x07,0x00,0x70,0x00}; //,0x07
9 uchar get_num,getflag,flag=0;
10 uint keyflag;
11 uchar UARTKeyFlag=0xaa;
12 static const char c_keyCode[16]={0x01,0x02,0x03,0x0a, /*键盘1,2,3,A*/
13 0x04,0x05,0x06,0x0b, /*键盘4,5,6,B*/
14 0x07,0x08,0x09,0x0c, /*键盘7,8,9,C*/
15 0x0e,0x00,0x0f,0x0d}; /*键盘*,0,#,D*/
16 uchar num3[8]={0xAA,0x01,0xfa,0xfb,0xfc,0xfd,0xfe,0xfa}; //,0xff
17
18 sbit One_Wire_Bus=P3^7;
19
20 //function define
21 /********************************************************************/
22
23 void One_Wire_Delay(unsigned char delay_time);
24 void One_Wire_Write_Byte(unsigned char oww_dat);
25 unsigned char One_Wire_Read_Byte(void);
26 void Read_18B20(void);
27 void Initize_One_Wire_Bus(void);
28 /********************************************************************/
29 data unsigned char GetScratchpad[2];
30
31
32 code unsigned char decimalH[16]={00,06,12,18,25,31,37,43,50,56,62,68,75,81,87,93};
33 code unsigned char decimalL[16]={00,25,50,75,00,25,50,75,00,25,50,75,00,25,50,75};
34 unsigned char ResultTemperatureH=0x00;
35 unsigned char ResultTemperatureLH=0x00;
36 unsigned char ResultTemperatureLL=0x00;
37 data unsigned char ResultSignal;
38 //The signal of temperature;
39 /********************************************************************/
40
41 //ds18b20 part
42 #define SkipRom 0xcc
43 #define ConvertTemperature 0x44
44 #define ReadScratchpad 0xbe
45
46 void keyhandle();
47 void scankey();
48 void delay(uint value);
49 void scrshift(uchar keyindex);
50 void numjudge();
51 void clearscr();
52 void statussend(uchar num[8]);
53 void statussend_one(uint num);
54 uchar keyjudge();
55
C51 COMPILER V8.02 DS18B20 06/12/2008 17:28:54 PAGE 2
56
57 void One_Wire_Delay(unsigned char delay_time);
58 void One_Wire_Write_Byte(unsigned char oww_dat);
59 unsigned char One_Wire_Read_Byte(void);
60 void Read_18B20(void);
61 void Initize_One_Wire_Bus(void);
62
63 /********************************************************************/
64 void Initize_One_Wire_Bus(void)
65 {
66 1 One_Wire_Bus=0;
67 1 One_Wire_Delay(80);//Bus master pulling low 488us
68 1 One_Wire_Bus=1;
69 1 One_Wire_Delay(25);//Resister pull up 158us;
70 1 }//Intialization the 1-wire devices;
71 /***********************************************************************/
72
73 /******************* ds 18b20 **********************************/
74 void One_Wire_Delay(unsigned char delay_time)
75 {
76 1 while(delay_time)delay_time--;//Delay time us :=(8+delay_time*6)us;
77 1 }
78 /***********************************************************************/
79 unsigned char One_Wire_Read_Byte(void)
80 {
81 1 bit temp_bit;
82 1 unsigned char i,result=0;
83 1 for(i=0;i<8;i++)
84 1 {
85 2 One_Wire_Bus=0;
86 2 One_Wire_Bus=1;
87 2 temp_bit=One_Wire_Bus;
88 2 One_Wire_Delay(11);//delay 62 us
89 2 if(temp_bit)
90 2 result|=0x01<<i;
91 2 }
92 1 return(result);
93 1 //return the result of the 1-wire device;
94 1 }//Read a byte from the 1-wire bus;
95 /***********************************************************************/
96 void One_Wire_Write_Byte(unsigned char oww_dat)
97 {
98 1 unsigned char i;
99 1 for(i=0;i<8;i++)
100 1 {
101 2 One_Wire_Bus=0;
102 2 if(oww_dat&0x01)One_Wire_Bus=1;
103 2 One_Wire_Delay(25);//delay 128 us
104 2 One_Wire_Bus=1;
105 2 oww_dat>>=1;
106 2 }
107 1 One_Wire_Delay(10);
108 1 }//Write a byte to the 1-wire bus;
109 /***********************************************************************/
110 void Read_18B20(void)
111 {
112 1 unsigned char tempH,tempL;
113 1 Initize_One_Wire_Bus();
114 1 num3[7] = 0x11;
115 1 One_Wire_Write_Byte(SkipRom);
116 1 num3[5] = 0x11;
117 1 _nop_();
C51 COMPILER V8.02 DS18B20 06/12/2008 17:28:54 PAGE 3
118 1 //There is just one DS1820 on the bus;
119 1 One_Wire_Write_Byte(ConvertTemperature);
120 1 num3[5] = 0x22;
121 1 One_Wire_Delay(5);
122 1 //Start to convert temperature;
123 1 Initize_One_Wire_Bus();
124 1 num3[7] = 0x22;
125 1 One_Wire_Write_Byte(SkipRom);
126 1 num3[5] = 0x33;
127 1 _nop_();
128 1 One_Wire_Write_Byte(ReadScratchpad);
129 1 num3[5] = 0x44;
130 1 GetScratchpad[0]=One_Wire_Read_Byte();
131 1 num3[6] = 0x11;
132 1 //Master samples the LSB temperature from the scratchpad;
133 1 GetScratchpad[1]=One_Wire_Read_Byte();
134 1 num3[6] = 0x22;
135 1 //Master samples the MSB temperature from the scratchpad;
136 1 One_Wire_Delay(120);
137 1 tempH=(GetScratchpad[1]<<4)|(GetScratchpad[0]>>4);
138 1 tempL=(GetScratchpad[0]&0x0f);
139 1 Initize_One_Wire_Bus();
140 1 //Issue a reset to terminate left parts;
141 1 if(tempH&0x80)
142 1 {
143 2 tempH=~tempH;
144 2 tempL=~tempL+1;
145 2 ResultSignal=1;
146 2 //Negative temperature;
147 2 }
148 1 ResultTemperatureH=tempH;
149 1 ResultTemperatureLL=decimalL[tempL];
150 1 ResultTemperatureLH=decimalH[tempL];
151 1
152 1
153 1
154 1 //Result of temperature;
155 1 }//Read the byte0 and byte1 from scratchpad;
156 /************************************************************************/
157
158
159 void main()
160 {
161 1 TMOD=0x11; /*Timer0工作在案MODE1,16位定时器，Timer1工作在MODE2,自动重新装载模式*/
162 1 /*| 定时器1 | 定时器1 |*/
163 1 /*| GATE|C/T| M1 | M0 | GATE|C/T| M1 | M0 |*/
164 1 TH0=(65536-SCAN_CYCLE)/256; /*设定Timer0每隔SCAN_CYCLEu中断一次*/
165 1 TL0=(65536-SCAN_CYCLE)%256;
166 1 TR0=1; /*启动TEMER0*/
167 1 T2CON=0x38; /*令定时器2作为串口波特率发生器*/
168 1 /*|TF2|EXF2|RCLK|TCLK|EXEN2|TR2|C/T2|CP/RL2|*/
169 1 TL2=0xd9; /*设定串口波特率为9600，晶振为12MHz*/
170 1 TH2=0xff;
171 1 RCAP2L=0xd9; /*根据串口波特率9600设定自动重载寄存器*/
172 1 RCAP2H=0xff;
173 1 TR2=1; /*启动定时器2*/
174 1 SCON=0x50; /*设定UART工作在MODE3模式，可传送和接收数据,REN=1*/
175 1 /*| SM0| SM1| SM2| REN| TB8| RB8| TI | RI |*/
176 1 IE=0x9a; /*使能总中断、Timer0,1中断、外部中断1,2*/
177 1 /*| EA| - | ET2| ES | ET1| EX1| ET0| EX0|*/
178 1 IP=0x12; /*优先Timer0中断*/
179 1 /*| - | - | PT2| PS | PT1| PX1| PT0| PX0|*/
C51 COMPILER V8.02 DS18B20 06/12/2008 17:28:54 PAGE 4
180 1
181 1 // P3=0xFF;
182 1 // p33 =0 ;
183 1 // p33 = 1;
184 1 // ds = 0 ;
185 1 GetScratchpad[0] = 0x00;
186 1 GetScratchpad[1] = 0x00;
187 1 while(1)
188 1 {
189 2 keyhandle();
190 2 // time_delay(1000000);
191 2 }
192 1 }
193
194
195 void keyhandle() //按键处理
196 {
197 1 uchar temp1,key;
198 1 uint aa=0,judge=0;
199 1 key=keyjudge();
200 1 if(key!=0x55)
201 1 {
202 2 temp1=c_keyCode[key];
203 2 switch(temp1)
204 2 {
205 3 case 0x0a: statussend(num1);
206 3 break;
207 3 case 0x0b: statussend(num2);
208 3 break;
209 3 case 0x0c:
210 3 /*{
211 3 Initize_One_Wire_Bus();
212 3 statussend(num3);
213 3 break;
214 3 } */
215 3 /*
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